Valve mechanism for



(No Model'.) 2 SheetsSheet 1.

v H. WARDEN. YALVE MECHANISM FOR GAS ENGINES.

No. 499,865. Patented June 20, 1893.

WHneSSeS: inventor:

2 Sheets-Sheet 2.

(No Model.)

H. WARDEN. VALVE MECHANISM FOR GAS ENGINES. No. 499,865.

' Patented June 20, 1 893 My :2 f v WH'HQS see: 5%

UNITED STATES PATENT, FFIC HENRY WARDEN, or PHILADELPHI PENNSYLVANIA'VALVE MECHANISM. FO eAs ssemr-zs.

SPECIFICATION forming part of Letters Patent No. 499,865, dated June 20,1893.

A pplioation filed March 9| 18933 To an whom; it: may concern:

Be it known that I, HENRY'WARDEm-OE the city and county of Philadelphia,State of Pen n sylvania, have invented a certain new and usefulImprovement in Valve Mechanism for Gas-Engines and other ,Uses, of whichthe following is a true and exact deScrip t-idmlrefer-Q enco being hadto the accompanying drawings, which form a part of this specificatioh.

My invention relates to the construction I and operation of slide'valvesand their actusting devices and is especially intended and adapted foruse with gasengi'ues although it can he used alsn 'with slidevalvesapplied to other engines or machines. v

The object of my invention is toprovide'a slide-valve with clampingmechanism which will com'e'into operation at a certain point or pointsin the movement of the 'valve holding it at those points tightlyto itsseat with suf: ficient pressure to resist whatever tendency there may heto lift therefrom and which, during the movements of the slide valve,will release this pressure permitting the valve to slide upon its seatwith'very littleresistance.

and thus at the same time economize the power required to move the valveand avoiding injurious wear to the valve and to the seat."

' Reference beingnow had "to the drawings which illustratemy.invention,-Figure 1 is a side elevation-partly in section showing oneend of a gas engine cylinder 'with slide valve and clamping mechanism.-Fig. 1- is an ale 35.

vation of the mechanism'for operating the valve-rods. Fig. 2 is asimilarview showing a modification. ot the clamping device; and Figs. 3and 4 similar views illustrating ,the movement of the valve and theaction of the clamping device;

A indicates the gas engine cylinder; B the piston'or plungerworking'init; E the head of the cylinder the outer 'face' of whichserves as the valve seat for the slide valve F.

C is a passage in the cylinder-head through which gas and air areadmitted the said passage having a port 0' in the valve seat; and D isthe'exhanst passage having a port D in the valve-seat. Between these twoportsis 50 the port E leading to the interior of the cylinder and havingpreferably the conical form shown; the conical projection B" on the pis-Serial No. 384,188. (Nomodald ton is adapted to substantially fit in andfill this conically-shaped port the purpose being to expelas perfectlyas possible all theprcducts of combustion from the cylinder when thepiston moves back to its extremeposition. In the slide valveF ports Fand F are formed and. valve-actuating mechanism as link G, heli-crank--G, connecting-rod G, and a cam on shaft H, notshown in the drawings, are

provided to give the proper'movem'ents to the valve.

Y In an engine of the character ill nstratedin operation holdingt-he'valve toits seat with v the necessary force but which, after theexplosion and preferably beforethe valve moves from the position itoccupies during-the ex-f plosion will release thh pressure onthe valvepermitting the valve-actuating mechanism to move it without undue andunnecessary re;

sistance; that is, the valve -is permitted to move from thepositiontshown in Fig. 2'to that shown in Fig. 4, then to that 'shown'inRig: 3, and then back to the position shown inFig. 2. before the. clampcomes again into ope-ration. Referring more particularly to Fig. 1. theclamping device there ,shewn consists of a plate L pivoted at one endl'to standards K'on' the head of the cylinder and connected at the otherend by means of arodP with an eccem tric Pf on shaft H; bolts M Msecure-a plate M to the plate L and through a perforation in the plateLbetve'en the bolts M a clamping head 0 extends in such way as to'restagainst the valve F, a coiled spring N being held between the clampinghead 0 and the plate M"; during the motion of the valve'the clampinghead O rests lightly againstit or remains entirelyont tcontact with it;at the proper time, to w't,"just before the explosion and when the va veis in the position shown,

2 J see.

5 of the spring, whichcanbe readily regulated, of course regulates theamount of pressnre exerted upon the valve; after the explosion andduring the working stroke the motion of the'eccentric governing theclamping devicepfis'hesflhe' plate Laway from the valve graduallyreleasing the pressure upon it and at the end of the working stroke thevalve-actuating mechanism moves the. valve in position. to exhaust thecylinder to' r receive a new charge and 'to close the port E before theclampagain comes into opera tion.. The importance of having aspring as Nto transmit the clamping pressure to the valve is of course obvious;withoutthe use of zosome such device the clamp would have to be.

adjusted with the utmost nicetyandflconld probably not be keptin orderunder the exigencies of. practical use.

, I have shown alight spring I secured to standards Jon each side-ofthe'slidevalve (one onlyheing shown in the drawings) which always exertsa light pressure to hold the valve to its seat; this spring is entirelyindependent of the clamping device and does not 0 exert pressure enoughto' offer any considerabl n s e. t th c aimant-attireve vet its functionbeing merely to hold-the valve to its seat so that the.e'xplosivemixtnre, at one point and the products of combustion atanother point will move through their determined paths and not escapebetween the valve audits seat As shown the clamp head 0 transmitsitspressnre to the valve through the spring I, said spring interveningbetween 4 the back of the valve, and the clamp; .this

however is a purely immaterial detailot construction. 1

'Referring-now to the modification shown in I igs.'--2, 3 and 4, theclamping device here consists of 'a lever-L pivoted to standards K andhaving secured to its-cylinder R which extendsover the backof the valveand has a portion B of its surface planed otf flat; the lever L isactuated through a red by an 'ec 5o centric in the same way as explainedas to Fig. 1. On the back of the valve F a strong 'spring'N' is securedby means of a bolt Q assing through a slot or perforation 01;. anotherbolt,'Q', passing through a slot n in the opposite end of thespringserves to hold it in position though not to clamp itto the. backof the valve. As shown a second light spring, l', is secnredhpon theback of the valve prior to the explosionof the charge the in Figs. 3-andt' with it's fiatside R running substantially parallel to the ba'ckofthe valve not against the spring N; prior to the explosion ofthecha'rge, the valve being in the po+ sitioii shown in-Fig. 2, thelever L and cy'lin- ;the light spring I downiagain'st the spring N andthen pressing against both springs until the force exerted is snflicientto hold the valve to its seat during the explosion, at;- her which thecylinder returns to the position shown in Figs. 3 and 4 permitting thevalve R with its'fiattened side R is essentiallya cam and itwill'beobvious that any cam with proper conformation canbe usdin like manher.It is also obvious ofcourse that the position of the spring throughwhich I conupon the v'alve,'is entirely immaterial so long as aconstruction is adopted .by which a yielding pressure is exerted betweentheclamp and the valve. 7

Having now described my invention, what I claim as new, and desire tosecure by Letters '.,Rste t.i::',

l'l lhe conibin'atidn' with a valve seat, ot a slide valve adapted tomove thereon, clampits seat, a spring arranged'between-thc clampingmechanism-and the valve, means for moving, the valve, and. independentmeanafor actuating the clamp to release the pressure on the valve whileit is moving and clamp it tight at a definite point in itspath.

v2. Thecombination with a valve seat, a valve-adapted to movethereon-and means for operating the valve, of a'clamp, means for movingthe clamp so that-when moved it will hold the valve to its seat and aspring between the clamping mechanism and the valve. 3. Thecombination'with a valve seat, a valve adapted'to move thereon and meansfor operating the valve-, ot'. a spring operating to hold the alve toits seati.with a light pressure, a. clamp operating'when put inoperation to bear against the-spring and hold the valve firmly to itsseat and means for operating the clamp.

y HENRY WYARDEN. Witnesses:

LIsLE STOKES,

I JosHUA MATLACK, J r.v

spring N, Dnring the movements of the 'and pressing lightly against thespringI. bnt a v sider it preferable that the clamp should act 7 ingmechanism arranged tohold the valve on cylinder R remains in theposition indicated dcr'R are moved to the position shownin. .thatfignre,the cylinder in turning pressing to move-freely upon its seat. Thecylinder

